So you are hoping for the creation of an independant state because of Bitcoin on an island. This is impossible for the sole reason that no state will leave sovereignty over a piece of its land, so except if your plan is to buy a whole country that will not be feasable.
Lol or unless you're president of a country, you can just apply bitcoin as your primary currency but I'm sure you'll get pressure and protest from many parties, your cabinet, etc. Bitcoin is obviously still impossible for now getting legalized. The government has not yet wanted to legalize something anonymous and decentralized